No one uses Facebook enough to actually have their whole life archived on the internet. You're running from a fantasy.
Obviously I do, therefor your argument is invalid.
A lot of people do multiple post a day on facebook and use it as their only private messaging solution, it's as close as you can get to having your whole life archived on the internet.
Maybe you don't, but what about you and the sum of your friends and friends of your friends? That doesn't just mean tagging pictures or facial recognition - that includes collating ips and times - in someone checks into Starbucks with a NATed ipv4 ip from Starbucks wlan and your visit fb from the same external ip...